/Engine/Plugins/Editor/ObjectMixer/ObjectMixer/Source/ObjectMixer/Public/Views/List/Modes/ObjectMixerOutlinerMode.h
Called when a payload is dropped onto a target
virtual void OnDrop ( [ISceneOutlinerTreeItem](API\Editor\SceneOutliner\ISceneOutlinerTreeItem) & DropTarget, const [FSceneOutlinerDragDropPayload](API\Editor\SceneOutliner\FSceneOutlinerDragDropPayload) & Payload, const [FSceneOutlinerDragValidationInfo](API\Editor\SceneOutliner\FSceneOutlinerDragValidationInfo) & ValidationInfo ) const